Logging fatal errors and timeout

I use the error handler function found at http://www.php.net/manual/en/ref.errorfunc.php . Whenever a fatal error has occurred, it does not log the error. I tried adding E_CORE_ERROR, E_CORE_WARNING, E_COMPILE_WARNING, E_COMPILE_ERROR and so that whenever they occur, it will log itself to a log file. Another question related to that is how do I log a timeout error for the fopen() function? When fopen() times out, it produces a fatal error and fatal error is not being logged.